Abstract : During this reporting period, a paper on the study of longitudinal modes and the aberration correction potential of a PCR based on a continuous-wave dye laser with a sodium phase conjugate mirror was published in Optics Letters as well as a paper on multiresonant behavior in nearly degenerate four-wave mixing in sodium. In addition, we report the measurement of spatial and temporal properties of a PCR based on the photorefractive crystal BaTiO3, and pumped with mW power levels from a He-Ne or a Kr(+) ion laser. In the absence of an intracavity aperture, the output beam is observed to be elongated in the plane of the crystal axis, via preferential self-defocussing of the beam due to the large anisotropy of the photorefractive effect in BaTiO3. The resonator buildup time constants are found to be significantly larger than the time constants of the photorefractive response, particularly when the coherence length of the pump lasers are much smaller than the roundtrip distance in the phase-conjugate resonator. (Author)